Check for leaks

If you notice any fluid buildup near the unit or hear any escaping air while inspecting your HVAC system, this could be evidence of a leak. Leaks are always a problem. If you are unsure about patching a leak yourself, contact a professional and explain the situation.

However, most leaks can be easily repaired with weather stripping or caulk. First, you must identify the source of the leak. Next, cover it with a strip of weather stripping adhesive. Push it in gently at first, then more firmly once you see that the system is no longer leaking. Apply a small amount of caulk to the gap instead for minor or irregularly shaped leaks.